Of course, the most rewarding part is the "Aha" moment, the excitement of discovery and enjoyment of understanding something new, the feeling of being on top of a hill, and having a clear view. But most of the time, doing mathematics for me is like being on a long hike with no trail and no end in sight! I find discussing mathematics with colleagues of different backgrounds one of the most productive ways of making progress.

When another baby arrived, I realized that the problem could not be solved in the operating room, but that we had to combat the root causes of these atrocities. I decided to travel to the village of Kavumu to talk to the men: why don't you protect your babies, your daughters, your wives? And where are the authorities?

To get the most out of the world around you you’ve got to really look hard. Most people out walking in the woods don’t really look. They just glance around. They scan. Before I start a painting I spend a lot of time looking and thinking, I go out in the car and pull a chair out of the boot and sit in the woods. I sit there and smoke and just look.

A good coach is somebody who has a clear concept of what they want and what they love in the game, is capable of expressing it in an understandable way, and is able to obtain it on the football pitch. They're also someone who loves to help others. This means something more than just going out and coaching a session, they really try to understand who a player is and find the key to helping them. All players have different problems, and we have the capacity to help them solve them. That's why this is a very interesting aspect of being a coach, we have the chance to be capable to influence people's lives.

At Pixar when we were making Toy Story, there came a time when we were forced to admit that the story wasn't great. It just wasn't great. We stopped production for five months.... We paid them all to twiddle their thumbs while the team perfected the story into what became Toy Story. And if they hadn't had the courage to stop, there would have never been a Toy Story the way it is, and there probably would have never been a Pixar.

I didn't see it then, but it turned out that getting fired from Apple was the best thing that could have ever happened to me. The heaviness of being successful was replaced by the lightness of being a beginner again, less sure about everything. It freed me to enter one of the most creative periods of my life.

But the market was changing. The industry was changing. The scale was changing. And in the end we knew we would be either the last company to make it or the first to not make it. We were right on the edge. We thought we would be the last one that made it, but we were wrong. We were the first one that didn't. We put an end to the companies that tried to do that. We certainly made our fair share of mistakes, but in the end I think we should have taken a bit longer to realize the world was changing and just gone on to be a software company right off the bat.

I think the work speaks for itself. I don't think that people have special responsibilities just because they've done something that other people like or don't like. I think the work speaks for itself. I think people could choose to do things if they want to but we're all going to be dead soon, that's my point of view. Somebody once told me, they said "Live each day as if it would be your last and one day you'll certainly be right." I do that. You never know when you're going to go but you are going to go pretty soon. If you're going to leave anything behind its going to be your kids, a few friends and your work. So that's what I tend to worry about.

One of the saints in my life is this woman named Imogene Hill, who was a fourth-grade teacher who taught this advanced class. She got hip to my whole situation in about a month and kindled a passion in me for learning things. I learned more that year than I think I learned in any year in school.

Design is a funny word. Some people think design means how it looks. But of course, if you dig deeper, it's really how it works. The design of the Mac wasn't what it looked like, although that was part of it. Primarily, it was how it worked.